aylet-gtk: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/aylet-gtk - from package: aylet-gtk

You may install the required package with command apt-get install {package}

Error in other languages:
aylet-gtk: bevel nie gevind nie
aylet-gtk: comandă negăsită
aylet-gtk: comando não encontrado
aylet-gtk: commande introuvable
aylet-gtk: command not found
aylet-gtk: käsku ei ole
aylet-gtk: không tìm thấy lệnh
aylet-gtk: komanda nerasta
aylet-gtk: Kommando nicht gefunden.
aylet-gtk: kommandot finns inte
aylet-gtk: komut yok
aylet-gtk: nie znaleziono polecenia
aylet-gtk: níor aimsíodh an t-ordú
aylet-gtk: no se encontró la orden
aylet-gtk: no s'ha trobat l'ordre
aylet-gtk: opdracht niet gevonden
aylet-gtk: parancs nem található
aylet-gtk: perintah tidak ditemukan
aylet-gtk: príkaz nenájdený
aylet-gtk: příkaz nenalezen
aylet-gtk: команда не найдена
aylet-gtk: командата не е открита
aylet-gtk: 命令找不到
aylet-gtk: コマンドが見つかりません